Kent James January 24, 2012 Announcements

ExQuilla is an addon for Mozilla's Thunderbird email client that allows access to both messages and contacts stored on Exchange Server 2007 or 2010. ExQuilla uses EWS (Exchange Web Services) for access to the server. ExQuilla (beginning with release 24) will work with either Thunderbird 17.* or 24.* on Windows, Linux, and OSX platforms.

ExQuilla is not free software, but is licensed on an annual basis. Beginning on November 1, 2013, users of ExQuilla 24 or later will require a license to continue using ExQuilla. New users are granted a free 60 day trial license automatically. For further information on ExQuilla licensing, see the ExQuilla Licensing Overview page.


You may download the current revision of ExQuilla from this link:

Windows:  http://mesquilla.net/exquilla-currentrelease-tb-windows.xpi

Linux: http://mesquilla.net/exquilla-currentrelease-tb-linux.xpi

OSX: http://mesquilla.net/exquilla-currentrelease-tb-osx.xpi


To install, download and save this file. Then from Thunderbird, open Tools/Add-ons, click on the Addon tools button  AddonActionsIcon.png and select "Install Add-on From File". Install the downloaded file, then restart Thunderbird.


The current version of ExQuilla supports messages and contacts. Calendar features (which work with the Lightning addon) are being added experimentally, and are not yet officially supported.

Supported Messaging Features

  • Normal reading, replying, composing, sending email
  • attachments
  • Thunderbird message filters
  • Thunderbird's bayesian junk mail filters
  • Virtual folders and folder-level search

Unsupported Messaging Features

  • Synchronizing Thunderbird tags and Exchange categories
  • Offline message sending
  • Thunderbird message starring is not synchronized with Exchange message flags
  • S/MIME messages can be read but not sent

Supported Contact (Address Book) features

  • Most standard Thunderbird fields
  • Subfolders of Exchange "Contacts" folder

Unsupported Contact (Address Book) features

  • Exchange-only fields (such as Spouse)
  • User photo

Instructions and Support

After installation, follow these instructions to add an Exchange Server account to Thunderbird. For additional information or help, see ExQuilla's help resources, as a question on the general forum, or submit a support ticket (login required).

License Purchase

To buy an individual license, go to this webpage:


To buy a domain license, go to this webpage:


Individual licenses cost $10 per year.

Domain licenses cost  $25 per domain plus $5 per user (with a minimum of 5 users), per year.


Kent James Feb 12 Announcements

Version 24.6 of ExQuilla has now been released, supporting Thunderbird versions 17 and 24. Existing users who downloaded ExQuilla from the mesquilla.net site should be updated automatically within a few days. Users who downloaded from the Mozilla addons site will need to wait a few of weeks until the review is complete there, or you may download the current revision of ExQuilla from these links:

Windows: http://mesquilla.net/exquilla-currentrelease-tb-windows.xpi

Linux: http://mesquilla.net/exquilla-currentrelease-tb-linux.xpi

OSX (Mac): http://mesquilla.net/exquilla-currentrelease-tb-osx.xpi

Changes since version 24.5

The pace of code change has been impacted by very rapid changes in the build infrastructure for the underlying Mozilla code, which has resulted in lots of effort to just be able to continue building the code. Hopefully the worst of that is over, and in the future we can add more fixes and features to ExQuilla.

Bug Fixes

  • Multiple accounts on the same server were getting mixed up
  • Accounts disappear intermittently (we believe that the core cause of this issue is now fixed)
  • Asking to delete attachment instead deletes message
  • Error "missing getIspDefaultsForEmail" sometimes prevents account creation
  • Junk warning "inputEncoding deprecated" eliminated

New Features

  • Spanish locale added
  • Save All Attachments now works
  • Emergency session license can be used if license fails